Sansa c140 when i turn my sansa on all i see is the sandisk logo and thats it. the screen isn't on lock or anything but thats all i ever see. whats wrong? oh and when i plug it up to my computer (emachines windows vista) windows media plyer says that theres no device connected. whats wrong?

You can try to reset the device by pressing the power button for about 15 to 20 seconds..if that doesnt work I would recommend you to go to the sandisk site to update the firmware on your device or you can contact sandisk to they can help you with updating the firmware on your device..Please follow the link below to get the firmware http://www.sandisk.com/Retail/Default.aspx?CatID=1376

The number for sandisk is 1-866-726-3475Please rate accordinglyThank youComputerrep

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You might have to hold the power button down for like 20-25 seconds and if that doesnt work what I would recommend you to go to the sandisk site to update the firmware on your device or you can contact sandisk to they can help you with updating the firmware on your device..Please follow the link below to get the firmware http://www.sandisk.com/Retail/Default.aspx?CatID=1376

The number for sandisk is 1-866-726-3475Please rate accordinglyThank youComputerrep

You can update the firmware. This will return your device to factory settings and fix any internal errors. All your current content will be deleted.

Download this file:http://www.sendspace.com/file/0mc3km

This is the firmware update utility for Sanca c140 (c100 series) devices.

There is a howto.txt file included, follow the instructions.I am posting the instructions here for convenience.

1. Download the attached file and save it on the desktop.(the player should not be attached to the computer at this point)2. Double click the file to run it.3. Accept the license agreement.4. Remove the battery from the mp3 player.5. Press and hold the center (select) button and connect it to the computer (keep holding the button, this is the firmware update mode).6. If the New Hardware Wizard appears (now you can let go of the select button), do the following: (if asked, choose not to connect to the internet for updates), then choose to install the device automatically, then follow the prompts to finish the installation.7. When the wizard comes up, or when the Update button becomes active (whichever happens first), you may release the select button.8. Click the Update button, and then click OK to the message that comes up.9. Wait until the upgrade finishes, then unplug the device.10. Put the battery back in, and turn on the player.11. Hopefully the update will be performed, then choose English for the language when prompted.12. Check if the issue is resolved.

Try a "hard reset".
Press and hold the power button for 15 seconds to shut off.
With the device off, press and hold the vol + and the center select button.
Power it back on, see if that works.
You can add to the question if you have more questions.
Best of Luck.